/**

 @Name：layui.form 表单组件
 @Author：贤心
 @License：MIT
    
 */

layui.define('layer', function (exports) {
    "use strict";

    var $ = layui.$
    , layer = layui.layer
    , hint = layui.hint()
    , device = layui.device()

    , MOD_NAME = 'form', ELEM = '.layui-form', THIS = 'layui-this'
    , SHOW = 'layui-show', HIDE = 'layui-hide', DISABLED = 'layui-disabled'

    , Form = function () {
        this.config = {
            verify: {
                required: [
                  /[\S]+/
                  , '必填项不能为空'
                ]
              , phone: [
                /^1\d{10}$/
                , '请输入正确的手机号'
              ]
              , email: [
                /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/
                , '邮箱格式不正确'
              ]
              , url: [
                /(^#)|(^http(s*):\/\/[^\s]+\.[^\s]+)/
                , '链接格式不正确'
              ]
              , number: function (value) {
                  if (!value || isNaN(value)) return '只能填写数字'
              }
              , date: [
                /^(\d{4})[-\/](\d{1}|0\d{1}|1[0-2])([-\/](\d{1}|0\d{1}|[1-2][0-9]|3[0-1]))*$/
                , '日期格式不正确'
              ]
              , identity: [
                /(^\d{15}$)|(^\d{17}(x|X|\d)$)/
                , '请输入正确的身份证号'
              ]
            }
        };
    };

    //全局设置
    Form.prototype.set = function (options) {
        var that = this;
        $.extend(true, that.config, options);
        return that;
    };

    //验证规则设定
    Form.prototype.verify = function (settings) {
        var that = this;
        $.extend(true, that.config.verify, settings);
        return that;
    };

    Form.prototype.checkInput = function (parentElem) {
        return checkInput(parentElem);
    }

    //表单事件监听
    Form.prototype.on = function (events, callback) {
        return layui.onevent.call(this, MOD_NAME, events, callback);
    };

    //赋值/取值
    Form.prototype.val = function (filter, object) {
        var that = this
        , formElem = $(ELEM + '[lay-filter="' + filter + '"]');

        //遍历
        formElem.each(function (index, item) {
            var itemForm = $(this);

            //赋值
            layui.each(object, function (key, value) {
                var itemElem = itemForm.find('[name="' + key + '"]')
                , type;

                //如果对应的表单不存在，则不执行
                if (!itemElem[0]) return;
                type = itemElem[0].type;

                //如果为复选框
                if (type === 'checkbox') {
                    itemElem[0].checked = value;
                } else if (type === 'radio') { //如果为单选框
                    itemElem.each(function () {
                        if (this.value == value) {
                            this.checked = true
                        }
                    });
                } else { //其它类型的表单
                    itemElem.val(value);
                }
            });
        });

        form.render(null, filter);

        //返回值
        return that.getValue(filter);
    };

    //取值
    Form.prototype.getValue = function (filter, itemForm) {
        itemForm = itemForm || $(ELEM + '[lay-filter="' + filter + '"]').eq(0);

        var nameIndex = {} //数组 name 索引
        , field = {}
        , fieldElem = itemForm.find('input,select,textarea') //获取所有表单域

        layui.each(fieldElem, function (_, item) {
            item.name = (item.name || '').replace(/^\s*|\s*&/, '');

            if (!item.name) return;

            //用于支持数组 name
            if (/^.*\[\]$/.test(item.name)) {
                var key = item.name.match(/^(.*)\[\]$/g)[0];
                nameIndex[key] = nameIndex[key] | 0;
                item.name = item.name.replace(/^(.*)\[\]$/, '$1[' + (nameIndex[key]++) + ']');
            }

            if (/^checkbox|radio$/.test(item.type) && !item.checked) return;
            field[item.name] = item.value;
        });

        return field;
    };

    //表单控件渲染
    Form.prototype.render = function (type, filter) {
        var that = this
        , elemForm = $(ELEM + function () {
            return filter ? ('[lay-filter="' + filter + '"]') : '';
        }())
        , items = {

            //下拉选择框
            select: function () {
                var TIPS = '请选择', CLASS = 'layui-form-select', TITLE = 'layui-select-title'
                , NONE = 'layui-select-none', initValue = '', thatInput
                , selects = elemForm.find('select')

                //隐藏 select
                , hide = function (e, clear) {
                    if (!$(e.target).parent().hasClass(TITLE) || clear) {
                        $('.' + CLASS).removeClass(CLASS + 'ed ' + CLASS + 'up');
                        thatInput && initValue && thatInput.val(initValue);
                    }
                    thatInput = null;
                }

                //各种事件
                , events = function (reElem, disabled, isSearch) {
                    var select = $(this)
                    , title = reElem.find('.' + TITLE)
                    , input = title.find('input')
                    , dl = reElem.find('dl')
                    , dds = dl.children('dd')
                    , index = this.selectedIndex //当前选中的索引
                    , nearElem; //select 组件当前选中的附近元素，用于辅助快捷键功能

                    if (disabled) return;

                    //展开下拉
                    var showDown = function () {
                        var top = reElem.offset().top + reElem.outerHeight() + 5 - $win.scrollTop()
                        , dlHeight = dl.outerHeight();

                        index = select[0].selectedIndex; //获取最新的 selectedIndex
                        reElem.addClass(CLASS + 'ed');
                        dds.removeClass(HIDE);
                        nearElem = null;

                        //初始选中样式
                        dds.eq(index).addClass(THIS).siblings().removeClass(THIS);

                        //上下定位识别
                        if (top + dlHeight > $win.height() && top >= dlHeight) {
                            reElem.addClass(CLASS + 'up');
                        }

                        followScroll();
                    }

                    //隐藏下拉
                    , hideDown = function (choose) {
                        reElem.removeClass(CLASS + 'ed ' + CLASS + 'up');
                        input.blur();
                        nearElem = null;

                        if (choose) return;

                        notOption(input.val(), function (none) {
                            var selectedIndex = select[0].selectedIndex;

                            //未查询到相关值
                            if (none) {
                                initValue = $(select[0].options[selectedIndex]).html(); //重新获得初始选中值

                                //如果是第一项，且文本值等于 placeholder，则清空初始值
                                if (selectedIndex === 0 && initValue === input.attr('placeholder')) {
                                    initValue = '';
                                };

                                //如果有选中值，则将输入框纠正为该值。否则清空输入框
                                input.val(initValue || '');
                            }
                        });
                    }

                    //定位下拉滚动条
                    , followScroll = function () {
                        var thisDd = dl.children('dd.' + THIS);

                        if (!thisDd[0]) return;

                        var posTop = thisDd.position().top
                        , dlHeight = dl.height()
                        , ddHeight = thisDd.height();

                        //若选中元素在滚动条不可见底部
                        if (posTop > dlHeight) {
                            dl.scrollTop(posTop + dl.scrollTop() - dlHeight + ddHeight - 5);
                        }

                        //若选择玄素在滚动条不可见顶部
                        if (posTop < 0) {
                            dl.scrollTop(posTop + dl.scrollTop() - 5);
                        }
                    };

                    //点击标题区域
                    title.on('click', function (e) {
                        reElem.hasClass(CLASS + 'ed') ? (
                          hideDown()
                        ) : (
                          hide(e, true),
                          showDown()
                        );
                        dl.find('.' + NONE).remove();
                    });

                    //点击箭头获取焦点
                    title.find('.layui-edge').on('click', function () {
                        input.focus();
                    });

                    //select 中 input 键盘事件
                    input.on('keyup', function (e) { //键盘松开
                        var keyCode = e.keyCode;

                        //Tab键展开
                        if (keyCode === 9) {
                            showDown();
                        }
                    }).on('keydown', function (e) { //键盘按下
                        var keyCode = e.keyCode;

                        //Tab键隐藏
                        if (keyCode === 9) {
                            hideDown();
                        }

                        //标注 dd 的选中状态
                        var setThisDd = function (prevNext, thisElem1) {
                            var nearDd, cacheNearElem
                            e.preventDefault();

                            //得到当前队列元素  
                            var thisElem = function () {
                                var thisDd = dl.children('dd.' + THIS);

                                //如果是搜索状态，且按 Down 键，且当前可视 dd 元素在选中元素之前，
                                //则将当前可视 dd 元素的上一个元素作为虚拟的当前选中元素，以保证递归不中断
                                if (dl.children('dd.' + HIDE)[0] && prevNext === 'next') {
                                    var showDd = dl.children('dd:not(.' + HIDE + ',.' + DISABLED + ')')
                                    , firstIndex = showDd.eq(0).index();
                                    if (firstIndex >= 0 && firstIndex < thisDd.index() && !showDd.hasClass(THIS)) {
                                        return showDd.eq(0).prev()[0] ? showDd.eq(0).prev() : dl.children(':last');
                                    }
                                }

                                if (thisElem1 && thisElem1[0]) {
                                    return thisElem1;
                                }
                                if (nearElem && nearElem[0]) {
                                    return nearElem;
                                }

                                return thisDd;
                                //return dds.eq(index);
                            }();

                            cacheNearElem = thisElem[prevNext](); //当前元素的附近元素
                            nearDd = thisElem[prevNext]('dd:not(.' + HIDE + ')'); //当前可视元素的 dd 元素

                            //如果附近的元素不存在，则停止执行，并清空 nearElem
                            if (!cacheNearElem[0]) return nearElem = null;

                            //记录附近的元素，让其成为下一个当前元素
                            nearElem = thisElem[prevNext]();

                            //如果附近不是 dd ，或者附近的 dd 元素是禁用状态，则进入递归查找
                            if ((!nearDd[0] || nearDd.hasClass(DISABLED)) && nearElem[0]) {
                                return setThisDd(prevNext, nearElem);
                            }

                            nearDd.addClass(THIS).siblings().removeClass(THIS); //标注样式
                            followScroll(); //定位滚动条
                        };

                        if (keyCode === 38) setThisDd('prev'); //Up 键
                        if (keyCode === 40) setThisDd('next'); //Down 键

                        //Enter 键
                        if (keyCode === 13) {
                            e.preventDefault();
                            dl.children('dd.' + THIS).trigger('click');
                        }
                    });

                    //检测值是否不属于 select 项
                    var notOption = function (value, callback, origin) {
                        var num = 0;
                        layui.each(dds, function () {
                            var othis = $(this)
                            , text = othis.text()
                            , not = text.indexOf(value) === -1;
                            if (value === '' || (origin === 'blur') ? value !== text : not) num++;
                            origin === 'keyup' && othis[not ? 'addClass' : 'removeClass'](HIDE);
                        });
                        var none = num === dds.length;
                        return callback(none), none;
                    };

                    //搜索匹配
                    var search = function (e) {
                        var value = this.value, keyCode = e.keyCode;

                        if (keyCode === 9 || keyCode === 13
                          || keyCode === 37 || keyCode === 38
                          || keyCode === 39 || keyCode === 40
                        ) {
                            return false;
                        }

                        notOption(value, function (none) {
                            if (none) {
                                dl.find('.' + NONE)[0] || dl.append('<p class="' + NONE + '">无匹配项</p>');
                            } else {
                                dl.find('.' + NONE).remove();
                            }
                        }, 'keyup');

                        if (value === '') {
                            dl.find('.' + NONE).remove();
                        }

                        followScroll(); //定位滚动条
                    };

                    if (isSearch) {
                        input.on('keyup', search).on('blur', function (e) {
                            var selectedIndex = select[0].selectedIndex;

                            thatInput = input; //当前的 select 中的 input 元素
                            initValue = $(select[0].options[selectedIndex]).html(); //重新获得初始选中值

                            //如果是第一项，且文本值等于 placeholder，则清空初始值
                            if (selectedIndex === 0 && initValue === input.attr('placeholder')) {
                                initValue = '';
                            };

                            setTimeout(function () {
                                notOption(input.val(), function (none) {
                                    initValue || input.val(''); //none && !initValue
                                }, 'blur');
                            }, 200);
                        });
                    }

                    //选择
                    dds.on('click', function () {
                        var othis = $(this), value = othis.attr('lay-value');
                        var filter = select.attr('lay-filter'); //获取过滤器

                        if (othis.hasClass(DISABLED)) return false;

                        if (othis.hasClass('layui-select-tips')) {
                            input.val('');
                        } else {
                            input.val(othis.text());
                            othis.addClass(THIS);
                        }

                        othis.siblings().removeClass(THIS);
                        select.val(value).removeClass('layui-form-danger')
                        layui.event.call(this, MOD_NAME, 'select(' + filter + ')', {
                            elem: select[0]
                          , value: value
                          , othis: reElem
                        });

                        hideDown(true);
                        return false;
                    });

                    reElem.find('dl>dt').on('click', function (e) {
                        return false;
                    });

                    $(document).off('click', hide).on('click', hide); //点击其它元素关闭 select
                }

                selects.each(function (index, select) {
                    var othis = $(this)
                    , hasRender = othis.next('.' + CLASS)
                    , disabled = this.disabled
                    , value = select.value
                    , selected = $(select.options[select.selectedIndex]) //获取当前选中项
                    , optionsFirst = select.options[0];

                    if (typeof othis.attr('lay-ignore') === 'string') return othis.show();

                    var isSearch = typeof othis.attr('lay-search') === 'string'
                    , placeholder = optionsFirst ? (
                      optionsFirst.value ? TIPS : (optionsFirst.innerHTML || TIPS)
                    ) : TIPS;

                    //替代元素
                    var reElem = $(['<div class="' + (isSearch ? '' : 'layui-unselect ') + CLASS
                    , (disabled ? ' layui-select-disabled' : '') + '">'
                      , '<div class="' + TITLE + '">'
                        , ('<input type="text" placeholder="' + placeholder + '" '
                          + ('value="' + (value ? selected.html() : '') + '"') //默认值
                          + (isSearch ? '' : ' readonly') //是否开启搜索
                          + ' class="layui-input'
                          + (isSearch ? '' : ' layui-unselect')
                        + (disabled ? (' ' + DISABLED) : '') + '">') //禁用状态
                      , '<i class="layui-edge"></i></div>'
                      , '<dl class="layui-anim layui-anim-upbit' + (othis.find('optgroup')[0] ? ' layui-select-group' : '') + '">'
                      , function (options) {
                          var arr = [];
                          layui.each(options, function (index, item) {
                              if (index === 0 && !item.value) {
                                  arr.push('<dd lay-value="" class="layui-select-tips">' + (item.innerHTML || TIPS) + '</dd>');
                              } else if (item.tagName.toLowerCase() === 'optgroup') {
                                  arr.push('<dt>' + item.label + '</dt>');
                              } else {
                                  arr.push('<dd lay-value="' + item.value + '" class="' + (value === item.value ? THIS : '') + (item.disabled ? (' ' + DISABLED) : '') + '">' + item.innerHTML + '</dd>');
                              }
                          });
                          arr.length === 0 && arr.push('<dd lay-value="" class="' + DISABLED + '">没有选项</dd>');
                          return arr.join('');
                      }(othis.find('*')) + '</dl>'
                    , '</div>'].join(''));

                    hasRender[0] && hasRender.remove(); //如果已经渲染，则Rerender
                    othis.after(reElem);
                    events.call(this, reElem, disabled, isSearch);
                });
            }

            //复选框/开关
          , checkbox: function () {
              var CLASS = {
                  checkbox: ['layui-form-checkbox', 'layui-form-checked', 'checkbox']
                , _switch: ['layui-form-switch', 'layui-form-onswitch', 'switch']
              }
              , checks = elemForm.find('input[type=checkbox]')

              , events = function (reElem, RE_CLASS) {
                  var check = $(this);

                  //勾选
                  reElem.on('click', function () {
                      var filter = check.attr('lay-filter') //获取过滤器
                      , text = (check.attr('lay-text') || '').split('|');

                      if (check[0].disabled) return;

                      check[0].checked ? (
                        check[0].checked = false
                        , reElem.removeClass(RE_CLASS[1]).find('em').text(text[1])
                      ) : (
                        check[0].checked = true
                        , reElem.addClass(RE_CLASS[1]).find('em').text(text[0])
                      );

                      layui.event.call(check[0], MOD_NAME, RE_CLASS[2] + '(' + filter + ')', {
                          elem: check[0]
                        , value: check[0].value
                        , othis: reElem
                      });
                  });
              }

              checks.each(function (index, check) {
                  var othis = $(this), skin = othis.attr('lay-skin')
                  , text = (othis.attr('lay-text') || '').split('|'), disabled = this.disabled;
                  if (skin === 'switch') skin = '_' + skin;
                  var RE_CLASS = CLASS[skin] || CLASS.checkbox;

                  if (typeof othis.attr('lay-ignore') === 'string') return othis.show();

                  //替代元素
                  var hasRender = othis.next('.' + RE_CLASS[0])
                  , reElem = $(['<div class="layui-unselect ' + RE_CLASS[0]
                    , (check.checked ? (' ' + RE_CLASS[1]) : '') //选中状态
                    , (disabled ? ' layui-checkbox-disbaled ' + DISABLED : '') //禁用状态
                    , '"'
                    , (skin ? ' lay-skin="' + skin + '"' : '') //风格
                  , '>'
                  , function () { //不同风格的内容
                      var title = check.title.replace(/\s/g, '')
                      , type = {
                          //复选框
                          checkbox: [
                            (title ? ('<span>' + check.title + '</span>') : '')
                            , '<i class="layui-icon layui-icon-ok"></i>'
                          ].join('')

                          //开关
                        , _switch: '<em>' + ((check.checked ? text[0] : text[1]) || '') + '</em><i></i>'
                      };
                      return type[skin] || type['checkbox'];
                  }()
                  , '</div>'].join(''));

                  hasRender[0] && hasRender.remove(); //如果已经渲染，则Rerender
                  othis.after(reElem);
                  events.call(this, reElem, RE_CLASS);
              });
          }

            //单选框
          , radio: function () {
              var CLASS = 'layui-form-radio', ICON = ['&#xe643;', '&#xe63f;']
              , radios = elemForm.find('input[type=radio]')

              , events = function (reElem) {
                  var radio = $(this), ANIM = 'layui-anim-scaleSpring';

                  reElem.on('click', function () {
                      var name = radio[0].name, forms = radio.parents(ELEM);
                      var filter = radio.attr('lay-filter'); //获取过滤器
                      var sameRadio = forms.find('input[name=' + name.replace(/(\.|#|\[|\])/g, '\\$1') + ']'); //找到相同name的兄弟

                      if (radio[0].disabled) return;

                      layui.each(sameRadio, function () {
                          var next = $(this).next('.' + CLASS);
                          this.checked = false;
                          next.removeClass(CLASS + 'ed');
                          next.find('.layui-icon').removeClass(ANIM).html(ICON[1]);
                      });

                      radio[0].checked = true;
                      reElem.addClass(CLASS + 'ed');
                      reElem.find('.layui-icon').addClass(ANIM).html(ICON[0]);

                      layui.event.call(radio[0], MOD_NAME, 'radio(' + filter + ')', {
                          elem: radio[0]
                        , value: radio[0].value
                        , othis: reElem
                      });
                  });
              };

              radios.each(function (index, radio) {
                  var othis = $(this), hasRender = othis.next('.' + CLASS), disabled = this.disabled;

                  if (typeof othis.attr('lay-ignore') === 'string') return othis.show();
                  hasRender[0] && hasRender.remove(); //如果已经渲染，则Rerender

                  //替代元素
                  var reElem = $(['<div class="layui-unselect ' + CLASS
                    , (radio.checked ? (' ' + CLASS + 'ed') : '') //选中状态
                  , (disabled ? ' layui-radio-disbaled ' + DISABLED : '') + '">' //禁用状态
                  , '<i class="layui-anim layui-icon">' + ICON[radio.checked ? 0 : 1] + '</i>'
                  , '<div>' + function () {
                      var title = radio.title || '';
                      if (typeof othis.next().attr('lay-radio') === 'string') {
                          title = othis.next().html();
                          othis.next().remove();
                      }
                      return title
                  }() + '</div>'
                  , '</div>'].join(''));

                  othis.after(reElem);
                  events.call(this, reElem);
              });
          }
        };
        type ? (
          items[type] ? items[type]() : hint.error('不支持的' + type + '表单渲染')
        ) : layui.each(items, function (index, item) {
            item();
        });
        return that;
    };

    var checkInput = function (parentElem) {
        var stop = null; //验证不通过状态
        var DANGER = 'layui-form-danger' //警示样式
           ,verify = form.config.verify //验证规则
           , verifyElem = parentElem.find('*[lay-verify]'); //获取需要校验的元素

        layui.each(verifyElem, function (_, item) {
            var othis = $(this)
            , vers = othis.attr('lay-verify').split('|')
            , verType = othis.attr('lay-verType') //提示方式
            , value = othis.val();

            othis.removeClass(DANGER); //移除警示样式

            //遍历元素绑定的验证规则
            layui.each(vers, function (_, thisVer) {
                var isTrue //是否命中校验
                , errorText = '' //错误提示文本
                , isFn = typeof verify[thisVer] === 'function';

                //匹配验证规则
                if (verify[thisVer]) {
                    var isTrue = isFn ? errorText = verify[thisVer](value, item) : !verify[thisVer][0].test(value);
                    errorText = errorText || verify[thisVer][1];

                    if (thisVer === 'required') {
                        errorText = othis.attr('lay-reqText') || errorText;
                    }

                    //如果是必填项或者非空命中校验，则阻止提交，弹出提示
                    if (isTrue) {
                        //提示层风格
                        if (verType === 'tips') {
                            layer.tips(errorText, function () {
                                if (typeof othis.attr('lay-ignore') !== 'string') {
                                    if (item.tagName.toLowerCase() === 'select' || /^checkbox|radio$/.test(item.type)) {
                                        return othis.next();
                                    }
                                }
                                return othis;
                            }(), { tips: 1 });
                        } else if (verType === 'alert') {
                            layer.alert(errorText, { title: '提示', shadeClose: true });
                        } else {
                            layer.msg(errorText, { icon: 5, shift: 6 });
                        }

                        //非移动设备自动定位焦点
                        if (!device.android && !device.ios) {
                            setTimeout(function () {
                                item.focus();
                            }, 7);
                        }

                        othis.addClass(DANGER);
                        return stop = true;
                    }
                }
            });
            if (stop) return stop;
        });

        return !stop;
    };

    //表单提交校验
    var submit = function () {
        var stop = null //验证不通过状态
       , field = {}  //字段集合
       , button = $(this) //当前触发的按钮
       , elem = button.parents(ELEM) //当前所在表单域
       , formElem = button.parents('form')[0] //获取当前所在的 form 元素，如果存在的话
       , filter = button.attr('lay-filter'); //获取过滤器
               
        if (!checkInput(elem)) return false;

        //获取当前表单值
        field = form.getValue(null, elem);

        //返回字段
        return layui.event.call(this, MOD_NAME, 'submit(' + filter + ')', {
            elem: this
          , form: formElem
          , field: field
        });
    };

    //自动完成渲染
    var form = new Form()
    , $dom = $(document), $win = $(window);

    form.render();

    //表单reset重置渲染
    $dom.on('reset', ELEM, function () {
        var filter = $(this).attr('lay-filter');
        setTimeout(function () {
            form.render(null, filter);
        }, 50);
    });

    //表单提交事件
    $dom.on('submit', ELEM, submit)
    .on('click', '*[lay-submit]', submit);

    exports(MOD_NAME, form);
});


